Props to you for the interview, that takes guts. And yes, try and find something to take your anger out on. For me, I bought a cheap stereo and a punching bag. I turned on my favorite music (could be angry, could be sad, didn’t really matter), and I would punch the hell out of the bag until I was exhausted. Then, I’d take a shower and watch a movie. It really helped to get my frustration out.